Abstract
The cam rack pinion (CRP) system takes the traditional rack and pinion concept and advances it by replacing the pinion teeth with bearing supported rollers that engage a trochoid rack tooth profile. The bearing supported rollers eliminate the sliding friction of the conventional rack and pinion with smooth rolling friction that yields a 99% efficient rotary to the linear motion conversion. In this study, the fatigue failure life of a CRP system was investigated. First, we investigated the difference in rack tooth profiles by changing the profile shift coefficient of CRP systems. Next, the Hertz contact stresses and tooth root bending stresses were analyzed by varying the profile shift coefficient to determine the tooth fatigue characteristics. It was found that the variation in the contact force with increasing the profile shift coefficient was insignificant, but the Hertz contact and tooth root bending stresses decreased significantly.
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